Researchers found that nearly two thirds of the estimated 2,300 heat deaths resulted from global heating intensified by fossil fuel emissions, but worry that officials undercount heat mortalities.By Bob BerwynHuman-caused global warming increased the peak temperatures of an early summer heatwave across much of Europe by up to 7 degrees Fahrenheit and tripled the number of expected heat deaths in 12 European cities, an international team of scientists reported Tuesday during an online press conference.

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